Stored Cross-Site Scripting Vulnerability in OpenEMR Patient Portal
CVE-2026-40508

5.1MEDIUM

Key Information:

Vendor

Openemr

Status
Openemr
Vendor
CVE Published:
19 August 2026

What is CVE-2026-40508?

OpenEMR versions prior to 8.3.0 are susceptible to a stored cross-site scripting vulnerability located in the patient portal template import handler. Authenticated users with Forms Administration permissions can exploit this vulnerability by uploading template files that contain malicious HTML or JavaScript. These scripts are stored unfiltered and remain dormant until an affected Forms Administration user views the template via the HTML editor, potentially executing harmful scripts in their browser session. Proper sanitization of inputs during the template upload process is essential to mitigate this risk.

Affected Version(s)

openemr 0

References

https://github.com/openemr/openemr/security/advisories/GH...
vendor-advisory
https://github.com/openemr/openemr/releases/tag/v8_3_0
release-notes
https://github.com/openemr/openemr/commit/ba316dd1d8de129...
patch

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alex Williams from Pellera Technologies
VulnCheck
.